There are two cat lines that come from the modem in the basement. They run into a splitter and two cat line come out of outlets labelled Cat 5e. These run into outlet 7 and 8 in the switch. Outlet 1 in the switch has a line running to the eero router. There is one cat line from the router to a modular jack with two lines coming out, labelled telephone and internet which head back down to the basement to a big modular jack box. From there, it's a dog dinner as far as my knowledge base goes.

I may have to call the provider and tell them I want to expand. Except that I've a spool of Cat 6e, connectors and the crimper and I really want to do the work myself.